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66 lines
1.9 KiB
66 lines
1.9 KiB
From: Peter Zijlstra <a.p.zijlstra@chello.nl>
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Subject: [PATCH 01/31] mm: serialize access to min_free_kbytes
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Patch-mainline: not yet
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There is a small race between the procfs caller and the memory hotplug caller
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of setup_per_zone_wmarks(). Not a big deal, but the next patch will add yet
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another caller. Time to close the gap.
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Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
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Signed-off-by: Suresh Jayaraman <sjayaraman@suse.de>
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---
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mm/page_alloc.c | 16 +++++++++++++---
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1 file changed, 13 insertions(+), 3 deletions(-)
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--- a/mm/page_alloc.c
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+++ b/mm/page_alloc.c
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@@ -165,6 +165,7 @@ static char * const zone_names[MAX_NR_ZO
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"Movable",
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};
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+static DEFINE_SPINLOCK(min_free_lock);
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int min_free_kbytes = 1024;
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static unsigned long __meminitdata nr_kernel_pages;
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@@ -4845,13 +4846,13 @@ static void setup_per_zone_lowmem_reserv
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}
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/**
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- * setup_per_zone_wmarks - called when min_free_kbytes changes
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+ * __setup_per_zone_wmarks - called when min_free_kbytes changes
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* or when memory is hot-{added|removed}
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*
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* Ensures that the watermark[min,low,high] values for each zone are set
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* correctly with respect to min_free_kbytes.
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*/
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-void setup_per_zone_wmarks(void)
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+static void __setup_per_zone_wmarks(void)
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{
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unsigned long pages_min = min_free_kbytes >> (PAGE_SHIFT - 10);
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unsigned long lowmem_pages = 0;
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@@ -4949,6 +4950,15 @@ static void __init setup_per_zone_inacti
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calculate_zone_inactive_ratio(zone);
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}
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+void setup_per_zone_wmarks(void)
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+{
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+ unsigned long flags;
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+
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+ spin_lock_irqsave(&min_free_lock, flags);
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+ __setup_per_zone_wmarks();
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+ spin_unlock_irqrestore(&min_free_lock, flags);
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+}
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+
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/*
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* Initialise min_free_kbytes.
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*
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@@ -4984,7 +4994,7 @@ static int __init init_per_zone_wmark_mi
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min_free_kbytes = 128;
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if (min_free_kbytes > 65536)
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min_free_kbytes = 65536;
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- setup_per_zone_wmarks();
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+ __setup_per_zone_wmarks();
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setup_per_zone_lowmem_reserve();
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setup_per_zone_inactive_ratio();
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return 0;
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